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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f79a4dd851252730e7c14a3150225a27196c8ab58c0e29bb1a78c4faaf47f3' 
  AND token = 'fnvsFwOSEzMG0j2YErfxapZuirtgUOlgE2dmcsuBJTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}