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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c1b98c53a5fb11054a754f8b1f4bf88ea7e32c942c5115e4a205c3d1feb266' 
  AND token = 'ht6j51qkNMYbq9c6p7n21JaH5z3SrDE+4+kI+zzz7Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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