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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdfe48d7a00b3e58a47f5861d3d55eaad44eddb308e7a2d9445b1b116dbddf3' 
  AND token = '4+58Lq9CVGC6j7ZdBKBEUItwUR+d95Na2OPOONabEBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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