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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baa265cbfb8a9cab1922e71649079a03c0bf9cc9b1f2cefccb53ebf43420f8f' 
  AND token = 'e+KnemjLDqGAgtjpciSF+rm2i8J3B1nlUA+roNlX2L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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