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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c11ed5886f7dfb33d30067770302c4a904d950fbc6e3d275c521e4cc1cbbbb' 
  AND token = '7fthkJw50LGZZriJgsiVlPUb1+s1lQCF/SH11qsEGSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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