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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e142ded3194b0486375357b5c513cc8a6d233a3ad4dd67aa0abf1d18a6c179' 
  AND token = 'JettcXjYrPv43g3tCmDXuULtrTjals4AmPNHTBW4e2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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