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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d18c89fa942bd8a93c185032ed948e2a5e8e7bd0d9e4e6493701e7076c64b1' 
  AND token = 'G1l88J04hy3sqzeFr2xHISarA+06gGqBGLbL0H5uns8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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