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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce2ab84e93dc9b1748b3e06f44ebbe445ba96ad515daf5d0c702349d8a77f09' 
  AND token = 'vh8OymLdR3y6Kk7en1snrfHbU9a29CzfVVWLXGJv2y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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